/*
* File      : crt_init.c
* This file is part of Device File System in RT-Thread RTOS
* COPYRIGHT (C) 2008-2015, RT-Thread Development Team
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License along
*  with this program; if not, write to the Free Software Foundation, Inc.,
*  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date           Author       Notes
* 2014-12-03     Bernard      Add copyright header.
* 2014-12-29     Bernard      Add cplusplus initialization for ARMCC.
* 2016-06-28     Bernard      Add _init/_fini routines for GCC.
* 2016-10-02     Bernard      Add WEAK for cplusplus_system_init routine.
*/

#include <rtthread.h>

#ifdef __CC_ARM
extern void $Super$$__cpp_initialize__aeabi_(void);
/* we need to change the cpp_initialize order */
void $Sub$$__cpp_initialize__aeabi_(void)
{
	/* empty */
}
#elif defined(__GNUC__) && !defined(__CS_SOURCERYGXX_MAJ__)
/* The _init()/_fini() routines has been defined in codesourcery g++ lite */
void _init()
{
}

void _fini()
{
}

RT_WEAK void* __dso_handle = 0;

#endif

RT_WEAK
int cplusplus_system_init(void)
{
#if defined(__GNUC__) && !defined(__CC_ARM)
	typedef void (*pfunc)();
	extern pfunc __ctors_start__[];
	extern pfunc __ctors_end__[];
	pfunc* p;

	for(p = __ctors_start__; p < __ctors_end__; p++)
		(*p)();

#elif defined(__CC_ARM)
	/* If there is no SHT$$INIT_ARRAY, calling
	 * $Super$$__cpp_initialize__aeabi_() will cause fault. At least until Keil5.12
	 * the problem still exists. So we have to initialize the C++ runtime by ourself.
	 */
	typedef void PROC();
	extern const unsigned long SHT$$INIT_ARRAY$$Base[];
	extern const unsigned long SHT$$INIT_ARRAY$$Limit[];

	const unsigned long* base = SHT$$INIT_ARRAY$$Base;
	const unsigned long* lim  = SHT$$INIT_ARRAY$$Limit;

	for(; base != lim; base++) {
		PROC* proc = (PROC*)((const char*)base + *base);
		(*proc)();
	}

#endif

	return 0;
}
INIT_COMPONENT_EXPORT(cplusplus_system_init);

